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Fixed a race conditon when adding a transport and then an endpoint.

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To fix issue #3611966, KeyManagerImpl's handling of TransportAddedEvent
was made asynchronous. This made it possible for a thread to call
KeyManager.endpointAdded() before the KeyManager had asynchronously
handled the TransportAddedEvent from a previous call to
DatabaseComponent.addTransport().
This commit is contained in:
akwizgran
2013-05-14 20:54:23 +01:00
parent 673d7fa0c3
commit dddd15cd10
7 changed files with 22 additions and 20 deletions
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14
briar-core/src/net/sf/briar/invitation/Connector.java
View File

@@ -288,19 +288,25 @@ abstract class Connector extends Thread {
db.setRemoteProperties(contactId, remoteProps);
// Create an endpoint for each transport shared with the contact
List<TransportId> ids = new ArrayList<TransportId>();
for(TransportId id : localProps.keySet())
if(remoteProps.containsKey(id)) ids.add(id);
Map<TransportId, Long> latencies = db.getTransportLatencies();
for(TransportId id : localProps.keySet()) {
if(latencies.containsKey(id) && remoteProps.containsKey(id))
ids.add(id);
}
// Assign indices to the transports deterministically and derive keys
Collections.sort(ids, TransportIdComparator.INSTANCE);
int size = ids.size();
for(int i = 0; i < size; i++) {
Endpoint ep = new Endpoint(contactId, ids.get(i), epoch, alice);
TransportId id = ids.get(i);
Endpoint ep = new Endpoint(contactId, id, epoch, alice);
long maxLatency = latencies.get(id);
try {
db.addEndpoint(ep);
} catch(NoSuchTransportException e) {
continue;
}
keyManager.endpointAdded(ep, crypto.deriveInitialSecret(secret, i));
byte[] initialSecret = crypto.deriveInitialSecret(secret, i);
keyManager.endpointAdded(ep, maxLatency, initialSecret);
}
}

10
briar-core/src/net/sf/briar/transport/KeyManagerImpl.java
View File

@@ -252,13 +252,9 @@ class KeyManagerImpl extends TimerTask implements KeyManager, DatabaseListener {
return new ConnectionContext(c, t, secret, connection, s.getAlice());
}
public synchronized void endpointAdded(Endpoint ep, byte[] initialSecret) {
Long maxLatency = maxLatencies.get(ep.getTransportId());
if(maxLatency == null) {
if(LOG.isLoggable(INFO))
LOG.info("No such transport, ignoring endpoint");
return;
}
public synchronized void endpointAdded(Endpoint ep, long maxLatency,
byte[] initialSecret) {
maxLatencies.put(ep.getTransportId(), maxLatency);
// Work out which rotation period we're in
long elapsed = clock.currentTimeMillis() - ep.getEpoch();
long rotation = maxLatency + MAX_CLOCK_DIFFERENCE;